ⓘ Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Pentium Pro, Celeron, Pentium ..

                                     

ⓘ Slot 1

Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Pentium Pro, Celeron, Pentium II and the Pentium III. Both single and dual processor configurations were implemented.

Intel switched back to the traditional socket interface with Socket 370 in 1999.

                                     

1. General

With the introduction of the Pentium II CPU, the need for greater access for testing had made the transition from socket to slot necessary. Previously with the Pentium Pro, Intel had combined processor and cache dies in the same Socket 8 package. These were connected by a full-speed bus, resulting in significant performance benefits. Unfortunately, this method required that the two components be bonded together early in the production process, before testing was possible. As a result, a single, tiny flaw in either die made it necessary to discard the entire assembly, causing low production yield and high cost.

Intel subsequently designed a circuit board where the CPU and cache remained closely integrated, but were mounted on a printed circuit board, called a Single-Edged Contact Cartridge SECC. The CPU and cache could be tested separately, before final assembly into a package, reducing cost and making the CPU more attractive to markets other than that of high-end servers. These cards could also be easily plugged into a Slot 1, thereby eliminating the chance for pins of a typical CPU to be bent or broken when installing in a socket.

The form factor used for Slot 1 was a 5-inch-long, 242-contact edge connector named SC242. To prevent the cartridge from being inserted the wrong way, the slot was keyed to allow installation in only one direction. The SC242 was later used for AMDs Slot A as well, and while the two slots were identical mechanically, they were electrically incompatible. To discourage Slot A users from trying to install a Slot 1 CPU, the connector was rotated 180 degrees on Slot A motherboards.

With the new Slot 1, Intel added support for symmetric multiprocessing SMP. A maximum of two Pentium II or Pentium III CPUs can be used in a dual slot motherboard. The Celeron does not have official SMP support.

There are also converter cards, known as Slotkets, which hold a Socket 8 so that a Pentium Pro CPU can be used with Slot 1 motherboards. These specific converters, however, are rare. Another kind of slotket allows using a Socket 370 CPU in a Slot 1. Many of these latter devices are equipped with own voltage regulator modules, in order to supply the new CPU with a lower core voltage, which the motherboard would not otherwise allow.

                                     

2. Form factors

The Single Edge Contact Cartridge, or SECC ", was used at the beginning of the Slot 1-era for Pentium II CPUs. Inside the cartridge, the CPU itself is enclosed in a hybrid plastic and metal case. The back of the housing is plastic and has several markings on it: the name, "Pentium II"; the Intel logo; a hologram; and the model number. The front consists of a black anodized aluminum plate, which is used to hold the CPU cooler. The SECC form is very solid, because the CPU itself is resting safely inside the case. As compared to socket-based CPUs, there are no pins that can be bent, and the CPU is less likely to be damaged by improper installation of a cooler.

Following SECC, the SEPP -form Single Edge Processor Package appeared on the market. It was designed for lower-priced Celeron CPUs. This form lacks a case entirely, consisting solely of the printed-circuit board holding the components.

A form factor called SECC2 was used for late Pentium II and Pentium III CPUs for Slot 1, which was created to accommodate the switch to flip chip packaging. Only the front plate was carried over, the coolers were now mounted straight to the PCB and exposed CPU die and are, as such, incompatible with SECC cartridges.

                                     

3. History

Historically, there are three platforms for the Intel P6-CPUs: Socket 8, Slot 1 and Socket 370.

Slot 1 is a successor to Socket 8. While the Socket 8 CPUs Pentium Pro directly had the L2-cache embedded into the CPU, it is located outside of the core on a circuit board shared with the core itself. The exception is later Slot 1 CPUs with the Coppermine core which have the L2-Cache embedded into the die.

In the beginning of 2000, while the Pentium-III-CPUs with FC-PGA-housing appeared, Slot 1 was slowly succeeded by Socket 370, after Intel had already offered Socket 370 and Slot 1 at the same time since the beginning of 1999. Socket 370 was initially made for the low-cost Celeron processors, while Slot 1 was thought of as a platform for the expensive Pentium II and early Pentium III models. Cache and core were both embedded into the die.

Slot 1 also obsoleted the old Socket 7, at least regarding Intel, as the standard platform for the home-user. After superseding the Intel P5 Pentium MMX CPU, Intel completely left the Socket 7 market.



                                     

4. Chipsets and officially supported CPUs

Via Apollo Pro 133

  • FSB: 66, 100, and 133 MHz
  • UDMA/33 VT82C596A, UDMA/66 VT82C596B/VT82C686A, UDMA/100 VT82C686B
  • AGP 2× Mode
  • Supported CPUs: All Slot 1 CPUs
  • Introduced in: July 1999

Via Apollo Pro 133A

  • Introduced in: Oct 1999
  • AGP 4× Mode
  • Supported CPUs: All Slot 1 CPUs
  • Allowed up to two CPUs for SMP
  • FSB: 66, 100, and 133 MHz
  • UDMA/66 VT82C596B/VT82C686A, UDMA/100 VT82C686B
                                     

4.1. Chipsets and officially supported CPUs Intel 440FX

  • Supported RAM type: EDO-DRAM
  • Pentium II with 66 MHz FSB
  • PIO/WDMA
  • Pentium Pro
  • Introduced in: May 6, 1996
  • FSB: 66 MHz
  • Celeron Covington, Mendocino
  • Supported CPUs
  • Used in both Socket 8 Pentium Pro and Slot 1 Pentium II, early Celerons
  • Allowed up to two CPUs for SMP
  • Does not support AGP or SDRAM
                                     

4.2. Chipsets and officially supported CPUs Intel 440LX

  • UDMA/33
  • Supported CPUs: Pentium II, Celeron
  • AGP 2× Mode
  • Pentium II with 66 MHz FSB
  • Celeron Covington, Mendocino
  • Introduced in: August 27, 1997
  • Supported RAM type: EDO-DRAM, SDRAM
  • FSB: 66 MHz
  • Allowed up to two CPUs for SMP
  • Introduced support for AGP and SDRAM


                                     

4.3. Chipsets and officially supported CPUs Intel 440EX

  • FSB: 66 MHz
  • UDMA/33
  • Pentium II with 66 MHz FSB
  • Supported RAM type: EDO-DRAM, SDRAM
  • Introduced in: April, 1998
  • Supported CPUs: Pentium II, Celeron
  • AGP 2× Mode
  • Celeron Covington, Mendocino
  • Same specifications as 440LX, but memory support limited to 256MB and no SMP support.
                                     

4.4. Chipsets and officially supported CPUs Intel 440ZX

  • Supported CPUs
  • Celeron
  • UDMA/33
  • Pentium II with 66 and 100 MHz FSB
  • Introduced in: November 1998
  • Pentium III with 100 MHz FSB 133 with overclocking
  • FSB: 66 and 100 MHz some motherboards supported overclocking to 133 MHz, allowing usage of Socket 370 CPUs using a Slocket
  • AGP 2× Mode
  • Supported RAM types: SDRAM PC66 and PC100, PC133 with overclocking
                                     

4.5. Chipsets and officially supported CPUs Intel 820/820E Camino

  • FSB: 66, 100, and 133 MHz
  • UDMA/66 i820, UDMA/100 i820E
  • Supported CPUs: All Slot 1 CPUs
  • AGP 4× Mode
  • Allowed up to two CPUs for SMP
  • Supported RAM types: RDRAM, SDRAM PC133
  • Introduced in: November 1999
                                     

4.6. Chipsets and officially supported CPUs Via Apollo Pro / Pro+

  • Pentium II with 66 and 100 MHz FSB
  • AGP 2× Mode
  • Pentium Pro with 66 MHz FSB
  • UDMA/33 VT82C586B/VT82C596A, UDMA/66 VT82C596B
  • Pentium III with 100 MHz FSB 133 with overclocking
  • FSB: 66, 100 MHz some motherboards supported overclocking to 133 MHz, allowing usage of Socket 370 CPUs using a Slocket
  • Supported CPUs
  • Celeron
  • Introduced in: May 1998 Pro Plus: Dec 1998
                                     

4.7. Chipsets and officially supported CPUs Via Apollo Pro 133

  • FSB: 66, 100, and 133 MHz
  • UDMA/33 VT82C596A, UDMA/66 VT82C596B/VT82C686A, UDMA/100 VT82C686B
  • AGP 2× Mode
  • Supported CPUs: All Slot 1 CPUs
  • Introduced in: July 1999
                                     

4.8. Chipsets and officially supported CPUs Via Apollo Pro 133A

  • Introduced in: Oct 1999
  • AGP 4× Mode
  • Supported CPUs: All Slot 1 CPUs
  • Allowed up to two CPUs for SMP
  • FSB: 66, 100, and 133 MHz
  • UDMA/66 VT82C596B/VT82C686A, UDMA/100 VT82C686B


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